CN102164447A - Circuit device for driving at least one lighting device - Google Patents

Abstract

The invention relates to a circuit device for driving at least one lighting device (La1), the circuit device comprises an input end and at least a first processing device (VA1). The first processing device (VA1) comprises: a first input connecting end coupled with a first phase connecting end (L1) in a phase connecting end of the circuit device; a second input connecting end coupled with a dimming signal input connecting end (K) of the circuit device; a third input connecting end coupled with a null line connecting end (N) of the circuit device; a rectifier (GL1), an electronic ballast (EVG1), as well as voltage dividers (RL11, RL12), wherein the at least a first processing device (VA1) comprises diodes (D1), which are serially connected and coupled between the second input connecting end of the at least a first processing device (VA1)and the voltage dividers (RL11, RL12).

Description

Circuit arrangement for driving at least one lighting device

field of invention

The invention relates to a circuit arrangement for operating at least one luminous means. The circuit arrangement is described using the example of street lighting, however, as is obvious to a person skilled in the art, the circuit arrangement can also be used in other fields.

Background technique

In this respect, FIG. 1 shows a circuit arrangement known from the prior art for street lighting. In this case, the rectifier GL1 is connected on the input side to the first phase L1 of the three-phase power supply network and to the neutral line of the three-phase power supply network. The output of rectifier GL1 is coupled for power supply to electronic ballast EVG1 , which for its part supplies at least one luminaire La1 . Taking the mentioned street lighting as an example, the lamp power is often reduced at night in order to save energy. Switching lines with network potential are used for this. In this case, a signal is generated by means of a dimming keyer DIM, which is used for the control input St1 of the electronic ballast EVG1. The signal provided at the control input St1 of the electronic ballast EVG1 is evaluated with respect to the duration of the activation of the dimming keyer DIM or the number of activations of the dimming keyer DIM and a corresponding control of the lamp La1 is carried out. Dimming. For this purpose, a microprocessor is present in the electronic ballast, which counts the number of network waves, for example, during pressing of the dimming key DIM. In particular, the microprocessor can be designed to interpret a short press as on/off and a longer press as a dimming request.

A voltage divider comprising resistors RL11 and RL12 is coupled between the dimming keyer DIM and the rectifier output connection GND of the rectifier GL1. The tap point A1 of the voltage divider is coupled to the control input St1 of the electronic ballast EVG1. The rectifier output connection GND of the rectifier GL1 is the reference potential for the electronic ballast EVG1.

Although in a three-phase system there are multiple EVGs powered from rectifiers that are not fed by the phase coupled to the dimming keyer DIM, it is desirable, for cost and wiring reasons, that for all lighting Only one switch line is set for the controller, that is to say, only one dimmer keyer is set. In order to eliminate the influence between the light emitters, in the prior art, a relay is provided in each light emitter. The phase located in the respective luminaire, ie the phase from which the rectifier of the respective luminaire is supplied, is coupled via a corresponding relay to the control input St1 of the respective electronic ballast EVG. However, significant additional costs arise from the installation of the relays.

An alternative solution consists in using several switching lines, that is to say one switching line per phase. However, this results in increased wiring complexity and undesired additional costs.

Contents of the invention

It is therefore the object of the present invention to provide a circuit arrangement in which, although at least two phases of a three-phase network are used to supply the electronic ballast, mutual influences are excluded, wherein the circuit arrangement should be operated without relays and via only one The switch circuit can be realized.

This object is achieved by a circuit arrangement having the features of claim 1 .

According to the invention, a circuit arrangement for operating at least one luminous means comprises an input having a first phase connection for coupling to a first phase of a three-phase power supply network, for coupling to a second phase of a three-phase power supply network The second phase connection end coupled with the dimming signal input connection end coupled with the dimming signal source, wherein the dimming signal source includes a dimming keyer, and the dimming keyer is coupled in series with the dimming signal Between the input connection and the connection to the third phase of the three-phase supply network, the input also has a neutral connection for coupling to the neutral of the three-phase supply network. The circuit arrangement also comprises at least one first processing device, wherein the first processing device comprises for its part: a first input connection coupled to a first one of the phase connections of the circuit arrangement; a second input A connection end coupled to the dimming signal input connection end of the circuit arrangement; a third input connection end coupled to the neutral line connection end of the circuit arrangement; a rectifier having a first rectifier input connection end and a second rectifier input connection end , wherein the first rectifier input connection is coupled to the first input connection, wherein the second rectifier input connection is coupled to the third input connection, the rectifier also includes a first rectifier output connection and a second rectifier output connection; electronic A ballast, which is coupled to the first rectifier output connection and the second rectifier output connection for power supply, wherein the potential at the second rectifier output connection is a reference potential for the electronic ballast, wherein the electronic ballast comprising a dimming input, wherein the electronic ballast comprises an output for connection to at least one lighting device; and a voltage divider coupled in series between the second input connection and the second rectifier output connection, wherein The tap point of the voltage divider is coupled to the dimming input terminal of the electronic ballast. According to the invention, the first processing means further comprises a diode coupled in series between the second input connection of the at least one first processing means and the voltage divider.

The realization based on the present invention is shown with reference to FIG. 2 . FIG. 2 shows the first assembly correspondingly to FIG. 1 , where the rectifier GL1 is coupled to the first phase L1 and the neutral line of the three-phase power supply network. Figure 2 also shows a second assembly in which the rectifier GL2 is coupled to the second phase L2 and neutral of the three-phase supply network. The switching circuit is constituted in particular by the fact that the dimming keyer DIM is coupled between the third phase L3 of the three-phase supply network and node K, wherein node K is connected to the voltage divider RL11, RL12 of the first assembly and the divider of the second assembly. Compressor RL21, RL22 coupling.

It is known to shift the phases L1, L2, L3 relative to each other by 120° in three-phase supply networks. If the control inputs St1, St2 of the two components are coupled in point K, then the corresponding phases L1, L2 Phase-dependently, the balancing current I _a flows already without actuating the dimming keyer DIM. In the example shown in Fig. 2, the instantaneous voltage of phase L2 is positive and the instantaneous voltage of phase L1 is negative. Thus, the balancing current _{Ia flows} from phase L2 via rectifier GL2, rectifier output connection GND of rectifier GL2, voltage divider RL22, RL21, via node K to voltage divider RL11, RL12, and subsequently to the rectifier of rectifier GL1 Output connection terminal GND. A signal is thus generated at the tap points of the voltage divider RL11 , RL12 which, after corresponding evaluation in the electronic ballast EVG1 , is interpreted as a dimming signal even though the dimming key DIM is not depressed. At other times, that is to say in other phases, other balancing currents result. This causes unpredictable, continuously varying dimming and flickering effects.

Based on this knowledge, the flow of balancing currents and thus unwanted dimming and flicker effects is prevented according to the invention by coupling corresponding diodes between node K and the corresponding voltage divider. Due to the corresponding orientation of the diodes, only a current flow in the direction required when the dimming key DIM is pressed is achieved in order to apply the dimming signal to the corresponding control input of the corresponding electronic ballast. As a result, balancing currents and their undesired effects are suppressed very effectively. Expensive relays can be dispensed with. Since only one switch circuit is needed, the wiring complexity can be significantly reduced compared with the prior art.

In a preferred embodiment, the diodes are arranged such that the anode of the diode is coupled to the second input connection of the at least one first processing device and the cathode of the diode is coupled to the associated voltage divider. The flow of reverse balancing currents is thus very effectively prevented.

In a refinement of the circuit arrangement according to the invention, at least one second processing device is also provided, wherein the first input connection of the second processing device is connected to a phase not coupled to the first input connection of the first processing device. Connector coupling.

Finally, the input of the circuit arrangement may comprise a third phase connection for coupling to a third phase of the three-phase supply network, wherein the circuit arrangement further comprises third processing means, wherein the first input connection of the third processing means is connected to The third phase connection end is coupled. As a result, all three phase connections of the three-phase supply system can be used for supplying the electronic ballast without mutual influence and therefore without interference.

Description of drawings

Embodiments of the invention will now be further elucidated below with reference to the accompanying drawings. in:

FIG. 1 shows a schematic diagram of a circuit arrangement known in the prior art for operating at least one luminous means;

FIG. 2 schematically shows a sketch with preliminary considerations for illustrating the balancing currents causing the unwanted dimming and flickering effects;

FIG. 3 shows a schematic diagram of a first embodiment of a circuit arrangement according to the invention; and

FIG. 4 shows a schematic diagram of a second exemplary embodiment of a circuit arrangement according to the invention.

Detailed ways

FIG. 3 shows a schematic diagram of an exemplary embodiment of a circuit arrangement according to the invention. This example essentially corresponds to the sketch with preliminary considerations shown in FIG. 2 , so that the reference numbers introduced with reference to FIG. 2 are used for the exemplary embodiment shown in FIG. 3 and are not described again.

In contrast to the illustration in FIG. 2 , in the exemplary embodiment of the circuit arrangement according to the invention shown in FIG. 3 , a diode D1 or D2 is inserted between point K and the corresponding voltage divider RL11 , RL12 or RL21 , RL22 respectively. , wherein the corresponding diodes D1, D2 are arranged such that only a current flow from the dimming keyer DIM towards the corresponding voltage divider RL11, RL12 or RL21, RL22 is enabled. Thus, the flow of the balancing current I _a is effectively prevented (see FIG. 2 ). Only a current flow I _s from the switching line to the corresponding voltage divider is still possible.

The voltage divider RL11, RL12, rectifier GL1 and EVG1 are combined into a first processing device VA1, and the voltage divider RL21, RL22, rectifier GL2 and EVG2 are combined into a second processing device VA2.

The embodiment shown in FIG. 4 is designed inversely to the embodiment shown in FIG. 3 with respect to the signals provided to the evaluation unit at the corresponding control inputs St1 , St2 . The processing units VA1 , VA2 also include a voltage source +U for delivering a positive supply voltage. A further ohmic resistor is coupled between the corresponding connection to the voltage source +U and the corresponding voltage divider; in the processing unit VA1 the ohmic resistor _RL13 and in the processing unit VA2 the ohmic resistor _RL23 . Optionally, protective diodes D3, D4 connected in parallel with the corresponding voltage dividers can also be provided.

Through these measures, the voltage value is adjusted during normal operation via a voltage divider at the corresponding control input St1 , St2 . The corresponding electronic ballast EVG1 , EVG2 thus recognizes the signal. When the dimming keyer DIM is toggled, a low or negative voltage on phase L3 interrupts the current flow in the corresponding voltage divider. As a result, the voltage at the respective control input St1 , St2 drops to zero volts. In the absence of a signal at the corresponding control input St1 , St2 , the corresponding electronic ballast EVG1 , EVG2 recognizes that the dimming keyer DIM has been actuated.

In an embodiment not shown, the exemplary embodiment shown in FIGS. 3 and 4 is extended by a further processing device whose rectifier is coupled to the neutral line and the third phase L3 when L1 is replaced by L3, cf. View of Figure 1.

In all embodiments, the dimming key DIM can be embodied as a key or as a switch.

Claims (4)

1. A circuit arrangement for driving at least one light emitting device (La1), comprising: - an input having a first phase connection (L1) for coupling with a first phase of a three-phase power supply network, a second phase connection (L2) for coupling with a second phase of a three-phase power supply network ), a dimming signal input connection terminal (K) for coupling with a dimming signal source, wherein the dimming signal source includes a dimming keyer (DIM), which is coupled in series to the dimming signal input Between the connection terminal (K) and the connection terminal to the third phase (L3) of the three-phase power supply network, the input terminal also has a neutral line connection terminal (N) for coupling with the neutral line of the three-phase power supply network; - at least one first processing device (VA1), wherein the first processing device (VA1) comprises: -- the first input connection end, the first input connection end is coupled with the first phase connection end (L1) of the phase connection ends of the circuit arrangement; -- the second input connection end, the second input connection end is coupled with the dimming signal input connection end (K) of the circuit device; -- the third input connection end, the third input connection end is coupled with the neutral line connection end (N) of the circuit device; -- Rectifier (GL1), the rectifier (GL1) has a first rectifier input connection and a second rectifier input connection, wherein the first rectifier input connection is coupled to the first input connection, wherein the second rectifier input connection is coupled to the second rectifier input connection Three input connections are coupled, the rectifier also has a first rectifier output connection and a second rectifier output connection (GND), -- electronic ballast (EVG1), the electronic ballast (EVG1) is coupled to the first rectifier output connection and the second rectifier output connection (GND) for power supply, wherein on the second rectifier output connection (GND) The potential of is the reference potential for the electronic ballast (EVG1), wherein the electronic ballast (EVG1) includes a dimming input (St1), wherein the electronic ballast (EVG1) includes a the output of the device (La1); -- Voltage divider (RL11, RL12), the voltage divider (RL11, RL12) is coupled in series between the second input connection and the second rectifier output connection (GND), wherein the voltage divider (RL11, RL12) The tap point (A1) of the electronic ballast (EVG1) is coupled with the dimming input terminal (St1) of the electronic ballast (EVG1); wherein said at least one first processing means (VA1) comprises a diode (D1) coupled in series between the second input connection of said at least one first processing means (VA1) and a voltage divider (RL11, RL12). 2. The circuit arrangement according to claim 1, characterized in that the diode (D1) is arranged such that the anode of the diode (D1) is coupled to the second input connection of the at least one first processing device (VA1) and the diode The negative pole of (D1) is coupled to the voltage divider (RL11, RL12). 3. The circuit arrangement according to claim 1 or 2, characterized in that the circuit arrangement also comprises at least one second processing device (VA2), wherein the first input connection of the second processing device (VA2) is the same as The phase connection (L2) which is not coupled to the first input connection of the first processing device (VA1) is coupled. 4. The circuit arrangement as claimed in claim 1, characterized in that the input of the circuit arrangement comprises a third phase connection (L3) for coupling with a third phase of a three-phase supply network, wherein the circuit arrangement A third processing device is also included, wherein the first input connection of the third processing device is coupled to the third phase connection.

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